Abstract
We present a computational study of current-driven vortex dynamics in a particular geometry, a hybrid Co/Au/Py nanocontact, in which the Co layer is not flat. The experimental measurements validate the numerical results. We identify the Py layer as dynamically active. The nonuniform magnetization configuration in the Co layer, which acts as spin polarizer, and the interlayer magnetostatic stray field, both of which are mostly determined by geometry, are shown to have crucial influence on the dynamic properties of the system. The frequency as a function of current at zero field and also as a function of an out-of-plane field for a fixed current are computed. An excellent quantitative agreement with experimental data is obtained, demonstrating a novel approach for tailoring vortex nano-oscillators.
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